Total (S_T) over peak (S_P) flux as a function of signal-to-noise ratio. The horizontal dashed line shows the S_T ∕S_P = 1 line. The upper curve was obtained by mirroring the lower curve (which encompasses 95% of the sources below the S_T ∕S_P = 1 line; see Eq. (1)) over the S_T∕S_P = 1 line. All sources below the upper curve are considered unresolved, while those above are considered resolved (see text for details).